<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }
    body {
      width: 100vw;
      height: 100vh;
      background: #34495e;
      display: flex;
      justify-content: center;
      align-items:  center;
    }
    main {
      width: 400px;
      height: 400px;
      display: flex;
      position: relative;
      background: #fff;
      border-radius: 50%;
    }
    main::before {
      content: '';
      width: 20px;
      height: 20px;
      background: #000;
      border-radius: 50%;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
    }
    main::after {
      content: '';
      width: 2px;
      height: 50%;
      background: #000;
      position: absolute;
      left: 50%;
      top: 0;
      transform: translateX(-50%);
      transition-duration: 60s;
      transform-origin: bottom;
      transition-timing-function: steps(60, start);
    }
    main:hover::after {
      transform: translateX(-50%) rotate(360deg);
    }
  </style>
</head>
<body>
  <main></main>
</body>
</html>